Cisco Cisco Aironet 1200 Access Point 릴리즈 노트

Since multicast frames are not retransmitted at the MAC layer, stations at the edge of the cell may fail 
to receive them successfully. If reliable reception is a goal, then multicasts should be transmitted at a 
low data rate. If support for high data rate multicasts is required, then it may be useful to shrink the cell 
size and to disable all lower data rates.

Depending on your specific requirements, you can take the following action:

If you need to transmit the multicast data with the greatest reliability and if there is no need for great 
multicast bandwidth, then configure a single basic rate, one that is low enough to reach the edges of 
the wireless cells

If you need to transmit the multicast data at a certain data rate in order to achieve a certain 
throughput, then configure that rate as the highest basic rate. You can also set a lower basic rate for 
coverage of non-multicast clients.

Layer 3 is not supported with NAC for MBSSID in this release.

In this release, Dynamic Frequency Selection (DFS) is automatically enabled on 5-GHz radios 
configured for use in North America. The 5-GHz radios use DFS to detect radar signals and avoid 
interfering with them. Radios configured for use in Europe and Singapore also use DFS. Other regulatory 
domains do not use DFS. Refer to the 

 for detailed information.

Cisco IOS Releases 12.3(2)JA and later change the default behavior of access points requesting an IP 
address from a DHCP server:

When you connect a 1200 or 1230 series access point with a default configuration to your LAN, the 
access point requests an IP address from your DHCP server and, if it does not receive an address, 
continues to send requests indefinitely. 

When you connect an 1100 series access point with a default configuration to your LAN, the 1100 
series access point makes several attempts to get an IP address from the DHCP server. If it does not 
receive an address, it assigns itself the IP address 10.0.0.1 for 5 minutes. During this 5-minute 
window, you can browse to the default IP address and configure a static address. If after 5 minutes 
the access point is not reconfigured, it discards the 10.0.0.1 address and reverts to requesting an 
address from the DHCP server. If it does not receive an address, it sends requests indefinitely. If you 
miss the 5-minute window for browsing to the access point at 10.0.0.1, you can power-cycle the 
access point to repeat the process. 

If the access points have SSIDs configured at the interface level (rather than at the global level), before 
upgrading to Cisco IOS Release 12.3(7)JA and above, upgrade to Cisco IOS Release 12.3(4)JA, save the 
configurations, and then upgrade to Release 12.3(8)JEC2. This procedure must be followed to make sure 
that the SSID configurations are converted from the interface level to global level.